Before writing any code, it helps to know what C actually is and why it has stayed relevant for decades. This module is that on-ramp: it's short, but it gives you the context that makes every later module click faster.
It starts with a quick overview of what C is and what makes it different from higher-level languages. From there it looks at why C is still used, in operating systems and other low-level software, so you can see where the skills you're about to build actually matter. It closes with a full beginner course that walks through the language, which you can use as a companion as you move through the rest of this course.
Watch the lessons in order, then continue on to Installation & Setup.
A fast, two-minute explanation of what C is and why it's considered one of the most influential programming languages of all time.
Why C hasn't gone away and how it continues to power operating systems and other low-level software, so you know where these skills apply.
freeCodeCamp's full introduction to C by Mike Dane: setup, variables, data types, arrays, functions, structs, pointers, and file I/O, a comprehensive tour that ties this course's modules together.